Technically they're already linked - it's an android, it can query the bluetooth mac address, the wifi mac address, the hostname of the device and the serial number / imei / esn of the device.

There's no "unlinking" it unless you manually modify the serial numbers on the device, which is possible, if you have qualcomm diagnostic tools (QPST/QXDM) and are able to communicate to the modem softband directly.